Shaving tool for automatic screw machines



Aug. 31, 1954 J. R; SMITH 2,687,664 SHAVING TOOL FOR A Filed Feb. 10, 1951 UTOMATIC SCREW MACHINES 2 Sheets-Sheet l INVENTOR. JOHN R. 604/ TH, BY

g- 31, 1954 J. R; SMITH 2,687,664

Sl-IAVING TOOL FOR AUTOMATIC SCREW MACHINES Filed Feb. 10; 1951 '2 Sheets-Sheet 2 II V IN VEN TOR. JOHN A. fiM/rfi, BY

inn/MEX Patented Aug. 31, 1 954 SHAVING TOOL FOR AUTOMATIC SCREW MACHINES John R. Smith, Miami, Fla.

Application February 10, 1951, Serial No.

1 Claim.

This invention relates to the art of automatic screw machines and embodies particularly certain novel tool holding means for such machines.

The presentimprovements chines of the same general class.

An object of th invention has been to provide improved tool holders involving the use of tools supported in a novel manner for simplicity and accuracy of adjustment and complemented by work supporting members, adjustable and a under practical conditions of service.

A further object of the invention resides in the provision of tool holding means and work supporting means so constructed that the device tate eitherforwardly or backwardly.

The invention further contemplates tool holdreversible in a manner to position the cutting tool either over or under the work and on either the front or back slide and shaver will be more clearly defined in the following description, reference being had to the ac- -ccmpanying drawings, wherein has been illusalso quickly and easily E trated the preferred forms of the device and wherein like characters of reference are employed to denote like parts throughout.

In the drawings:

Figure 1 is a tool post of an mounted thereon,

Figure 2 is a front elevation thereof, removed from the tool post,

Figure 3 is a transverse vertical section, taken on line 3-3 of Figure 1, V

Figure 4 is a top plan view of the device of Figure 1,

Figure 5 is a vertical longitudinal section, taken on line 5-5 of Figure 4,

Figure 6 is a horizontal section, taken on line 8-45 of Figure 5,

Figure 7 is a perspective view of a modified form of offset work engaging member employed when shaving narrow shoulders,

Figure 8 is a view similar to Figure 1, but illustrating a form shaver,

Figure 9 is a .front elevation of the structure of Figure 8, with the tool post omitted,

Figure 10 is a top plan view of the structure of Figure 8,

Figure 11 is a vertical longitudinal section, taken on line 1 [-11 of Figure 9,

Figure 12 is a perspective view of the adjustable work supporting roller of Figure 8,

Figure 13 is a perspective view of an offset work supporting roller as employed with the structure of Figure 8, and

Figure 14 is a ing tool.

Referring specifically to therdrawings and particularly to Figures 1 to 7 inclusive, the numeral perspective view of a form shav- The structure of Figures 1 to 7 is designed :as a blade shaver and its primary purpose is to teblade shaving tool 2i,

adjustment to the cilitate the shaving of shoulders and straight bodies back of a head where the conventional box tool cannot be employed. It is also a finishing tool used to hold diameters to close tolerances and eliminating second operational work, such as grinding shoulders to the finished diameters after the piece is dropped off the automatic screw machine.

The tool holder l i embodies a semi-cylindrical head i2, having flat parallel side walls l3 adapted to be alternately supported against the wing 9, determined by the position in which the device is used. The head i2 is provided with upper and lower jaws it and i5, spaced apart and parallel with each other. The jaw l5 extends beyond the jaw M, for a purpose to be described. The jaws are co-extensive in width with the head l2. The jaws are equidistantly spaced above and below the horizontal center line of a concentric opening it, formed transversely through the head.

The opening it is counterbored at opposite ends,

as at ii and removably supports a threaded bushing it, having a head flange l9, seating within either of the counterbores ll. The bushing has threaded engagement with the clamping bolt til at assembly and serves to rigidly support the bushing against the wing 9 whereby the tool holder may partake of vertical swinging movement.

The jaw i l, adjacent its outer end, is provided with a vertically arranged rectangular opening 26, extending entirely therethrough. A

rectangular in cross-section, is adapted to traverse the opening 2i] and in operative position projects below the under face of the jaw. The blade 2! is bevelled upwardly and rearwardly, providing a cutting edge 22. Rearwardly of the opening 20, the jaw is provided with a relatively large cylindrical opening 23, extending downwardly from the upper face of the jaw to a depth substantially half the thickness of the jaw. The opening 23 partially bisects the opening 2E1. Concentric to the opening 23 is a threaded cylindrical opening 24, extending through the under face of the jaw. A tool adjusting threaded stud 25, has threaded engagement with the opening 2 and carries adjacent its upper end, a cylindrical collar 26, having a diameter to traverse the opening 23. A slotted head 2i serves to facilitate the rotative adjustment of the stud. The collar 26 engages a slot 28, formed in the rear face of the tool 2| and serves to shift the tool in a vertical plane when the stud is rotated, thus imparting a very fine tool cutting edge 22. Set screws 29 threaded into suitable openingsin opposite sides of the jaw id, serve to rigidly fix the tool 2| after adjustment.

The jaw l5, adjacent its outer end, is provided with a generally square and vertically arranged opening 39, slidably receiving a bifurcated block 3i, rotatably supporting a roller 32, upon a cross shaft 33. The roller has a diameter substantially equal to the thickness of the block and projects above the top of the block to serve as a against the side of the work at a point diametrically opposite to the point of cutting contact of the tool 2!. The forward location of the block 3!, positioning the cutting edge 22 of the tool on an exact axial alignment with the roller, is clearly illustrated in Figures 1 and 5. The block 3i is adjustable toward and from the tool 2|, under the influence of a threaded stud 34, having threaded engagement in a threaded opening 35 of the jaw l5,

device with the that is substantially axially aligned with the opening 2 of the jaw i l. The stud 34 carries a collar 33 and a slotted head 31. The collar has rotative movement in an enlarged cylindrical recess 33, concentric to the opening 35. The collar 38 engages a transverse slot 39, formed in the rear wall of the block Lil. It will therefore be apparent, that rotative movement of the stud 34 causes the block and its supported roller 32 to move toward or from the tool 2i. As clearly shown in Figures 1 and 5, the contacting parts of the tool 2! and the roller 32, are equidistantly spaced above and below the horizontal center line of the head l2, thus placing the work, indicated at W, on a direct center with the tool holder l I. Set screws it, threaded in suitable threaded openings of the jaw l5, serve to positively lock the block Si in adjusted position.

The offset roll M, illustrated in Figure '7, is employed when it is desired to shave narrow shoulders. The roll M is rotatably supported in a side cut-out of a block 42, identical in dimensions to the block 3|. The block 62 is provided with slots at upon opposite sides for the reception of the collar 36, thus making the block reversible for either a right or left shaving job. The roll M is constructed so that the roll is approximately ten thousandths of an inch in from the outside edge of the blade.

The blade shaver so far described, can be used in four different positions, that is, on the front slide with the work spindle running forward or backward or on the back slide with the work spindle running forward or backward. This is possible, since the tool can be reversed by removmg the clamping bolt ill, then removing the bushing, turning the holder upside down and reinserting the bushing from the other side and then replacing the clamping bolt l0. Thus, the tool holder is readily reversible so that the cutting edge of the blade 2! will be positioned at all times against the direction of movement of the work spindle. To properly balance the tool holder, a retractile coil spring M may be anchored to a suitable bracket 15, upon the tool post at one end, while the opposite end is anchored to a generally L-shaped bracket 4%, held upon the head of the tool holder by screws 4?. The lower leg of the bracket M5 is slotted, so that the bracket can be shifted to the opposite side of the tool holder, when used on the rear slide. When the tool holder is turned upside down as when being used on the front slide and the spindle is turning in a clockwise direction, the roller will be on top and the blade below. In this position, spring 44 will not be employed and one of the screws 4'! replaced in one opening ll of the head after the bracket is removed and serves to prevent the tool holder from falling down, yet permitting the tool holder to float. A flat spring, similar to that shown in Figure 8, will then be employed, to impart adequate tension on the holder against upward movement, while the screw ll limits the downward motion.

In the use of this form of the invention, the diameter of the work is determined and the blade and work supporting roller is adjusted in accordance with the particular cut. Once the device is set in position, all fine adjustments are made from the top, regardless of whether you are using the blade or the roller on top. This greatly facilitates the adjustment and the operator is able to accurately judge the necessary adjustment. After adjustment, the tool is employed in the usual manner. The independent adjustmounting and the structure the first form heretofore described.

The tool holder 48, embodies the same semicylindrical head 49, provided with forwardly projecting parallel jaws B and 5|.

a work engaging block 54 is transversely slotted upon its rear face,

threaded stud 59, in a threaded opening upper surface of the jaw with the opening 68 and rotatably receives collar 58.

69. The head is counterbored as before for the reception of the bushing flange, while the bushing is internally threaded for the reception of the clamping bolt It.

cutting edge 63.

The form shaver just described has been designed to shave the work with different contours or shapes. The roller comes in with a straight body on the piece and holds the spaced parallel trunnion blocks, a work engagsure spring carried by the tool post and bearing ing roller rotatably supported in the trunnion upon the upper part of the tool holder and a stop blocks with the trunnion blocks and roller travscrew carried by the side of the tool holder to ersing the slot and projecting beyond the forlimit the downward swinging movement with reward end of the jaw, the roller block provided 5 spect to the tool post. with a horizontal slot in its rear face, an adjusting screw device having threaded and trav- References Cited in the f of this p t n erse engagement in openings formed in the jaw, UNITED STATES PATENTS the screw device provided with a collar that engages in the slot of the block, the opposite jaw 10 gg f 0 Name Date 9 8 having a fiat inner surface provided with a lon- 1 f g f June gitudinal fiat upstanding key, the jaw and key so u R et 1 1 being jointly provided with a vertically arranged 1 35 Drowns 1921 square opening, a cutter block having its forward Drowns 1930 end bevelled and sharpened to provide a trans- 15 1820056 Drowns 1931 verse cutting edge, the block being supported Klem May 1936 upon the inner surface of the jaw, the cutter 21323324 July 1943 block being slotted throughout its length upon 2364320 scmltters 51 1944 its under side for the reception of the key, a 2,412,757 smlth 17, 1946 clailmpng device for thte cllgfr lilickfegllbodytizig 20 FOREIGN PATENTS a ea or engagemen in e s o o e cu er block, a stud carried by the clamping device and Number Coumry- Date projectin through the square opening to be en- 2438 Great Bntam Sept 1906 181,130 Great Britain June 12, 1922 gaged by a clamping nut below the jaw, a pres- 

